diff options
| author | Thomas Huth <thuth@linux.vnet.ibm.com> | 2015-02-12 18:09:26 +0100 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2015-02-18 09:37:14 +0100 |
| commit | 43d49b0115aef2ead5125d4aa9719852d47ef6fc (patch) | |
| tree | 1ff9a48479d1199105e41818f3baac65531c742c | |
| parent | 5a123b3c1a1d3540d4455772c42c466870d81061 (diff) | |
s390x/mmu: Add support for read-only regions
If the "DAT-protection" bit is set in the region table entry and EDAT is
enabled, only read accesses are allowed in the corresponding memory area.
Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
| -rw-r--r-- | target-s390x/cpu.h | 1 | ||||
| -rw-r--r-- | target-s390x/mmu_helper.c | 7 |
2 files changed, 5 insertions, 3 deletions
diff --git a/target-s390x/cpu.h b/target-s390x/cpu.h index c0016b69fc..08cdb1529e 100644 --- a/target-s390x/cpu.h +++ b/target-s390x/cpu.h @@ -837,6 +837,7 @@ struct sysib_322 { #define _ASCE_TABLE_LENGTH 0x03 /* region table length */ #define _REGION_ENTRY_ORIGIN ~0xfffULL /* region/segment table origin */ +#define _REGION_ENTRY_RO 0x200 /* region/segment protection bit */ #define _REGION_ENTRY_TF 0xc0 /* region/segment table offset */ #define _REGION_ENTRY_INV 0x20 /* invalid region table entry */ #define _REGION_ENTRY_TYPE_MASK 0x0c /* region/segment table type mask */ diff --git a/target-s390x/mmu_helper.c b/target-s390x/mmu_helper.c index 0c53ae92b3..702e8b82cb 100644 --- a/target-s390x/mmu_helper.c +++ b/target-s390x/mmu_helper.c @@ -188,9 +188,6 @@ static int mmu_translate_region(CPUS390XState *env, target_ulong vaddr, return -1; } - /* XXX region protection flags */ - /* *flags &= ~PAGE_WRITE */ - if (level == _ASCE_TYPE_SEGMENT) { return mmu_translate_segment(env, vaddr, asc, new_entry, raddr, flags, rw, exc); @@ -205,6 +202,10 @@ static int mmu_translate_region(CPUS390XState *env, target_ulong vaddr, return -1; } + if ((env->cregs[0] & CR0_EDAT) && (new_entry & _REGION_ENTRY_RO)) { + *flags &= ~PAGE_WRITE; + } + /* yet another region */ return mmu_translate_region(env, vaddr, asc, new_entry, level - 4, raddr, flags, rw, exc); |